Automatic draft regulator for boilers



Dec. l1, 1928.

L. W. EGGLESTON AUTOMATIC DRAFT REGULATOR FOR BOILERS Filed Feb. 27, 1925 Patented Dec. l1, 1928.

UNITED STATES PATENT OFFICE.

LEWIs W. EGGLESTON, OF BUFFALO, NEW YORK, AssIeNoR r.ro AMERICAN RADIATOR, COMPANY, or CHICAGO, vII.I.INOIs,:A CORPORATION or NRW JERSEY.

AUTOMATIC DRFT-REGULATOR FOR BOLERS. y

Application filed February 27, 1923. Serial No. 621,683.

My invention relates to improvements in heating apparatus, and has for its principal object the provision of a simple, compact and -eiiicient device for controlling the rate of fuel consumption in a boiler, furnace or anal-A mine the temperature at which the heatingV apparatus is to be' maintained. A

Further, this invention hasfor its object thek provision of hand-operated means i'or setting the mechanism whereby the temperature ofthe heat generator is predetermined.

Other objects and advantages will in part 1 be obvious and Vin part be pointed out hereinafter.

'lo the attainment of the aforesaid obje-cts and ends my invention consists in the ynovel details of construction, and in the combination, connection and arrangement of parts hereinafter more fully described and then pointed ont in the-claims.

In the accompanying drawings forming part of this specification- Figure 1 is a side view, partly broken away and sectioned, showing a boiler provided with a regulator embodying the principles of my invention;

Fig. 2 1s a ce-ntral vertical side sectional view through the draft regulator;

Fig; 3 is a rear view of 'the regulator, and

Fig. 4' is an enlarged detail transverse section of the corresponding parts-shown in side view at Fig. 2. 1

In said drawings there is shown a combined boiler' and heater 10 comprising a hol-1 low front section 11, a hollow back section 12, and a plurality of substantially loop-shaped intermediate sections 13. vThe front section 11 is provided with the usual fuel opening having a door 13, a slicing opening having a door 14, an ash-pit opening having a door 15, and adjacent to its top with a flue opening provided with a door 16.

Within the boiler, betweenthe front and back sections 11 and'12, are arranged a plurality of grate bars 17 positioned side by side and longitudinally ofthe boil-er. At the upper rear end the boiler is provided with a smoke outlet 18. In the bac-k section 12, adjacent the bottom of the boiler, is provided a cold 'air inlet 19wvliich communicates with the interior of the boiler below the grate 17.

Within the baci; section 12, near the upper. end thereof thereis formed Va cavity 25 in which is positioned a thermostatic element comprising an outer casing 26 and an inner metallic bellows 27, the space between casing 26 and bellows 27 being filled preferably with alcohol, ether or other suitabe volatile orv eX pansible fluid. The outer end Lof said bellowsV is joined vto the casing 26 to seal the space between them. At' its inner end the bellowsabuts against the casing 2(3"and is provided with a head 31 having a tube 32 extending therein and closed at its outer end. The inner end of a plunger 33 engages the head 31 and eXtend-sthrough the backwall and through a `bracket 35 fixed to the rear of the boiler and pivoted near saidy end upona 1imite edge pivot r 41 to form a short arm and along arm.v The latter carries at the end thereof` a damper plate 42 cooperating with the cold air inlet 19.

As long as the bellows is in its retracted position, the upper end'of the lever Ll() will be held inwardly and the lower endoutwardly to maintain the air inlet 19 "openand permit of the increased supplyof air which re-V the temperature rises sufiiciently to contract the bellows, the head 31, plunger 33, and the upper end of lever 40 move outwardly while the lower end of the lever moves inwardly to cause the plate L12 to seal the air inlet. opening 19 until the heat of the iire is reduced. The' either manually by means of the handle 55 9o sults In an Increase of temperature. Vhen long arm of the lever i0r greatly magnifies i the movement of the bellows. The upper or ee, in` an extensien` G/ofthe, bracket-135, shaftA having aspiral groove 49therein,

The lever; Ll0 may bifurcatedgtorthe great,-` erparft ot its length;so,` thatl the adjusting meehanism may be positioned between the armsand titlrereof: handle 5,5 `isfxed' to;` the outer endr of: the shaft uponwhich works a plate-` 56 having aniopeningfiSf-to rev eeive the shaft: 5l, and having a, depending finger 571` oper-atingl in the spiral 'roovgwl)` rllhe shaft isheld'` againstlateral movement by said handle andf a pinfi i contacting 4with opposite sides ofthe bracket, A Spring.

is attagohed at one endin apertoration in the plate yand atltheotherendto aerossban connecting arms 5.3 and;54. ltv will be obviousthatby.v turning the handle in one,

dir eetion on the other,` the plate 56; will be, caused l to travel inwardly or `outwardly to defcrease or increase,` respectively, the toreo which tends tor hold tlievdamperplate 42:

away from the inlet; 19. Thuse g., it; may

be` found that; with the plate 56 at,` the treme right offthesoremthe bellows will not develop, sufficient pressure to overcome the` tension of.,I the. spring 58 untill atemperature OQEZOQ'F. has been reached.4 Tzhe damper plate willremainalltlie Way open until about 2109 l1 Whemithebellon's eommenees vto overcome the tensionfofltlie spring. and gradually l moves thedamper plate towardfthe openingv i9; until the temperature 015220.? F; is atf.

tained when the airlinlettwillgbe completely elosedi, When the temperature is correspondingly 'reduced the damperf plate will move away1 from inletflQ, Amy, othentem-` perlature may lee-similarly predetermined by operatingthe plate 5 6 along the.- shaft;y Fil-to theA desired position., l'fdesned. aI scale may be` priovldedfon bracketv 35 to oooperateivith the handle.` nvhich thus nots as .-,anindieatoru,V If the member l56 issluttod towards the leftJ to' the.oppositey side of ever` l-O. the spring;

58 Will-thenaetto operate theelosure tte-A closeftheinl'et lQfindependent-ly ott-lie auto. matie control thereof, provi,ding` manual means for-controllingthe same.j

The arrangementof the springl ottlie regulator with retort-incerto the thermosensitive orv Dressuresensitive deviee QT'and the member, aljand plate 5G Work-ingL thereon is` such that the apparatus Will be caused to operate to openand close the damper at approximately the same differences in temperature at all points oi' adjustment.

l/Vhile the Vabove description contemplates eontroltofrthe draf-tin aeeordaneewvith the temperature developed. Within the boiler, it will be apparent that said Control may be made..V dependent upon; the pressure in the boiler by merely removing the easing 26 and exposing the bellows 27 direotly to saidpres- 75 sure.n Y

itis to benoted tirati-all the openings in the trontof the heating apparatus are closed by doors u-'hieh are ground to Ytit tiehtly against or over said openings in order to jpreventany admission or' air tothe interior of; the appa! ratus, andtllat the air necessary to support1 combusion is admitted; to the. heating appa? ratus Wholly through the airL inlety 19, whichA is automatically, controlled.,

lllhe above descriptionillustrates the, prin-` ciples embodiedin my invention, 4but it will be understood that various ehangesand mod ilieations may be made Within the seopeloi theI invention4 as defined by the-annexed 9"' Claims.l

Pavingv thus deseribed ,i myy said` invention what I claim anddesire to secure by, Letters. Patentis:

l. Thecombination ot a boiler havingv a; main yair supply,inletgwitha closure tor said inlet, means responsive to Conditions Within the boiler for aetna-ting saidelosure to control the passage of. airl through. saidA inlet, means for normally preventing actuation of` 104 said elosureuntil a predetermined condition is reached, and-means forshitting said see-A ondnamed means to reversethe actionthereofy topermit` of the control offsaid closure independentlyptthe automaticeontrol there 105 of, substantially as specified. A

2., Tfheicombin ation-V of, afboiler haring a main air supply inlet, withi a,v closure, forA said inlet., means responsiveA to. conditions Withinl the boiler` for aetuatingsaidgClosure toicontnolL thefpassage oi:4 airl through said inlet, means for normally preventingactuationl of saidi o lesurenntil predetermined condition is reaohechtandmans for, shitting said second namedrmeanslwhereby,toeactuate .H5 said` closure at--any predetermined Condition, said last namedv` means,being-operable to .r e verse the action of said second namedimeans to permit of l the control of said closure in dependently, of, the automatic controlK there- 015substantially,A as. specified.`

3. The combination of. a boiler; having),` a,

m ain 4 air supply. inlet, withl a Closure for4 said, inlet, means` responsive to; conditions. with-V intheY boilenfor actuating,-saidi closure to` 125 control thefpassage `otair through said inlet, resilient means for, normally-` preventing? actuation of said elosureuntil a; predeter ined condition isreaC-hed, and. means tor shifting said resilient means to reverse the 13u action thereofto permitl of the control :of said closure independently of the automatic control thereof, substantially as specified.'

4. The combi-nation of a boiler having a main air supply inlet, Awith a closure for said inlet,-a pivoted lever to which said closure -is attached at'one end, means responsive to conditions within the boiler and connected to the other end of said lever for actuating said closure to control the 'passage of air through said inlet,'a resilient member connectedA at one end to said lever towards said closure, and connected at its opposite end to a part adjacent to and below the pivotv of the opposite side of said lever, and means for shifting the last named end of said member from one iside to said lever, substantially as specilied'.

5. The combination of a boiler having a main air supply inlet, with a lever suspended from a point adjacent-to its upper end, a closure for said inlet connected to the free end of said lever, means responsive to tempera# `ture within `the boiler and associated with said lever Afor actuating said closure to control the passage ofl air through said inlet, .a resilient member connected at one end tosaid leverrandextending upwardly at an acute angle thereto and connected at its opposite end at a point adjacent to the pivot of ysaid lever, and manually operable nieans'for varying the position of said resilient'member in iccordance with a predetermined temperature at which said closure is to be actuated by said responsive means,substantially as speciied.

l6. The combination of a boiler v having a vmain air supply inlet in the wall thereof,

with a closure for said inlet, actuating means responsive to conditions within the boiler mounted on Vsaid wall inspaced relation to and above said inlet, a lever pivotally mounted on said wall at a point between said inlet and said actuating means` and extending downwardly along said wall from said actuating means towards said inlet; said lever being connected at one end to said closure, and being operatively associated at the opposite side of said pivot with said actuating means, and a resilient member connected at one end to said lever at a point towards said closure, and extending along said lever towards the pivoted end thereof at an acute angle therewith, and connected at its opposite end to an adjacent part, substantially as specified. v

7 The combination of a boiler having a main air supply inlet, with a closure for said inlet, a lever to which said closure is connected at one end, means responsive to conditions within the boiler and connected to the other end of said lever for actuating said closure to control the passage of air through said inlet, a resilient member connected at one end to said lever, and extending along the same at an acute angle therewith, and

means at the opposite end of said member: for movingsaid opposite end transversely of said lever to vary the angle between said` member and said lever,'substantially as spec` ified.. f 1, l

8.l vThe combination of a boiler. having av main air supply inlet, a lever suspended from a point adjacent to its upper end, a closure ior'said inlet secured to the free end ci said lever, means responsive to temperature within the boilerand connected to said lever adjacent to its upper end for actuating said clo sure to control the passage of air through said. inlet, a resilient member connected at one end to said lever adjacent to said closure and eX'-l tending towards the pivotal endio'f said lever and atan acute angle thereto, and means at the other end ot saidl resilient member for adjusting the upperfendl of said resilient member towards and from said lever to vary the .angle thereof` with respect to said inain'air supply inlet, with a closure for said inlet, a lever to vwhichsaid closure is attached at one end, means responsive to teinperature withinthe boiler and connected tov the other end of said lever for actuating said closure to control the'passage of air through said inlet, Va resilient member connected at one end to said lever for, preventing actuation of said closure until a predetermined temperature is reached, and means for varying the angular position of said member relative to saidy lever in accordance with the temperature at which said closure may be actuated, substantially as specified. l 10. The combination of a boiler having a main air supply inlet,fwith a closure for said inlet, a lever to which said closure is attached at one end, means responsive to temperature within the boiler and connected to the other end of said lever for actuating said closure to control the passage of airk through said'inlet, a resilient member connected at one end to said lever for preventJ vture within the boiler and connected to the other end of said lever for actuating said closure: to control the passage of air through said inlet, a resilient member connected at one end to said lever for preventing actual# tion of said closure until apre'deterneined temperature is reached, and means for var vl ing,` the position oi the other end of said meniber relative to said lever in accordance' with.

the temperature at which said closure may be actuated, said last-named ii'ieans comprising a screw, aiiieinber operable axially oi said screw, and to which the other end oi said resilient member is attached, substantially as specitie-d. Y

l2. The combination of a boiler having a main air supply inlet, witliia closure 'for said inlet, means responsiw to temperature Within' the boiler for actuating. said ,closure to control the passage' ol air through said V13. The combination of a boiler having al main air supply inlet, with a closure for said inlet, means responsive to temperature With- 1n the boiler or actuatingV said closure to control the passage of air through said inlet,-

and adjustable means operatively associated With said closure for varying* the position ol suoli Closure in accordance With any pre= determined teiiiperatureat which? said closure is actuated by said responsive means; said adjustable means being operable to' con#A trol said closure vindependently ofthe aufto-V matie conti-ol thereof, substantially. as Spee ined. Y

lll,V The combination of boiler having. a:

main air supply inlet, with a Closure for' said inlet,- a lever toy one end of which said elosure is attached, means responsive to teinperaturev Within the `boiler and associa ed with the other end of said lever 'for actuating said closure to control thepassage of airA through inlet, adjustable means tor maintaining said closure in predetermined position, and means for manually operating` said Closure comprising, a screw, and means meeting with said sereiv and associated Vwith vsaid lever `for actuating` said closure independently of the auto-matic control thereof, for controlli-ng saidl closure independently of thel automatic control thereof, sull-estan tially as speeiied i 1.5.-Th-e combination of a boiler having a main air s-upp'lv inlet, with alever suspended i k. i A substantially trom its upper end, closure for said inlet carried b-v the free end oi" said lever, means respons-iveto' Conditions Within the boilerand connectedto` the other end oi Said lever for actuating sai-fd closure to' con; troi the passage of air therethrough, a re-v silient member for maintaining said closure in open position, a screw, and-means 'eo-aat ing'. with said serew for varyingthe angular relation of said resilient in'eniber and saidy lever' to vary the'` temperature' at' which saiff Closure may bey actuated, substantially 'as spe'eiiied Signed the ei-ty of Nerv York, iii the county and Statel of NeivYoi-i, this 19th day of February', one thousand niire hundred and twenty-thee.

EGGLESTON.

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